The world's longest river is the Nile River. It stretches over approximately 4,135 miles (6,650 kilometers), running through eleven countries in northeastern Africa, including Tanzania, Uganda, Rwanda, Burundi, Congo-Kinshasa, Kenya, Ethiopia, Eritrea, South Sudan, Sudan, and Egypt. The Nile River has been a vital lifeline for civilizations throughout history, providing water, fertile land for agriculture, and transportation routes. It is not only significant in terms of its length but also holds great cultural and historical importance to the regions it passes through.